498 lines
11 KiB
C
498 lines
11 KiB
C
/* $NetBSD: if_gif.c,v 1.8 2000/03/30 09:45:35 augustss Exp $ */
|
|
|
|
/*
|
|
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the project nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
/*
|
|
* gif.c
|
|
*/
|
|
|
|
#include "opt_inet.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/sockio.h>
|
|
#include <sys/errno.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/time.h>
|
|
#include <sys/syslog.h>
|
|
#include <machine/cpu.h>
|
|
|
|
#include <net/if.h>
|
|
#include <net/if_types.h>
|
|
#include <net/netisr.h>
|
|
#include <net/route.h>
|
|
#include <net/bpf.h>
|
|
|
|
#ifdef INET
|
|
#include <netinet/in.h>
|
|
#include <netinet/in_systm.h>
|
|
#include <netinet/in_var.h>
|
|
#include <netinet/ip.h>
|
|
#include <netinet/in_gif.h>
|
|
#endif /* INET */
|
|
|
|
#ifdef INET6
|
|
#ifndef INET
|
|
#include <netinet/in.h>
|
|
#endif
|
|
#include <netinet6/in6_var.h>
|
|
#include <netinet/ip6.h>
|
|
#include <netinet6/ip6_var.h>
|
|
#include <netinet6/in6_gif.h>
|
|
#endif /* INET6 */
|
|
|
|
#include <net/if_gif.h>
|
|
|
|
#include "gif.h"
|
|
#include "bpfilter.h"
|
|
|
|
#include <net/net_osdep.h>
|
|
|
|
#if NGIF > 0
|
|
|
|
void gifattach __P((int));
|
|
|
|
/*
|
|
* gif global variable definitions
|
|
*/
|
|
int ngif = NGIF; /* number of interfaces */
|
|
struct gif_softc *gif = 0;
|
|
|
|
void
|
|
gifattach(dummy)
|
|
int dummy;
|
|
{
|
|
struct gif_softc *sc;
|
|
int i;
|
|
|
|
gif = sc = malloc (ngif * sizeof(struct gif_softc), M_DEVBUF, M_WAIT);
|
|
bzero(sc, ngif * sizeof(struct gif_softc));
|
|
for (i = 0; i < ngif; sc++, i++) {
|
|
sprintf(sc->gif_if.if_xname, "gif%d", i);
|
|
sc->gif_if.if_mtu = GIF_MTU;
|
|
sc->gif_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
|
|
sc->gif_if.if_ioctl = gif_ioctl;
|
|
sc->gif_if.if_output = gif_output;
|
|
sc->gif_if.if_type = IFT_GIF;
|
|
if_attach(&sc->gif_if);
|
|
#if NBPFILTER > 0
|
|
bpfattach(&sc->gif_if.if_bpf, &sc->gif_if, DLT_NULL, sizeof(u_int));
|
|
#endif
|
|
}
|
|
}
|
|
|
|
int
|
|
gif_output(ifp, m, dst, rt)
|
|
struct ifnet *ifp;
|
|
struct mbuf *m;
|
|
struct sockaddr *dst;
|
|
struct rtentry *rt; /* added in net2 */
|
|
{
|
|
struct gif_softc *sc = (struct gif_softc*)ifp;
|
|
int error = 0;
|
|
static int called = 0; /* XXX: MUTEX */
|
|
int calllimit = 10; /* XXX: adhoc */
|
|
|
|
/*
|
|
* gif may cause infinite recursion calls when misconfigured.
|
|
* We'll prevent this by introducing upper limit.
|
|
* XXX: this mechanism may introduce another problem about
|
|
* mutual exclusion of the variable CALLED, especially if we
|
|
* use kernel thread.
|
|
*/
|
|
if (++called >= calllimit) {
|
|
log(LOG_NOTICE,
|
|
"gif_output: recursively called too many times(%d)\n",
|
|
called);
|
|
m_freem(m);
|
|
error = EIO; /* is there better errno? */
|
|
goto end;
|
|
}
|
|
|
|
ifp->if_lastchange = time;
|
|
m->m_flags &= ~(M_BCAST|M_MCAST);
|
|
if (!(ifp->if_flags & IFF_UP) ||
|
|
#if 0
|
|
sc->gif_flags & GIFF_INUSE ||
|
|
#endif
|
|
sc->gif_psrc == NULL || sc->gif_pdst == NULL) {
|
|
m_freem(m);
|
|
error = ENETDOWN;
|
|
goto end;
|
|
}
|
|
|
|
#if NBPFILTER > 0
|
|
if (ifp->if_bpf) {
|
|
/*
|
|
* We need to prepend the address family as
|
|
* a four byte field. Cons up a dummy header
|
|
* to pacify bpf. This is safe because bpf
|
|
* will only read from the mbuf (i.e., it won't
|
|
* try to free it or keep a pointer a to it).
|
|
*/
|
|
struct mbuf m0;
|
|
u_int af = dst->sa_family;
|
|
|
|
m0.m_next = m;
|
|
m0.m_len = 4;
|
|
m0.m_data = (char *)⁡
|
|
|
|
bpf_mtap(ifp->if_bpf, &m0);
|
|
}
|
|
#endif
|
|
ifp->if_opackets++;
|
|
ifp->if_obytes += m->m_pkthdr.len;
|
|
#if 0
|
|
s = splnet();
|
|
sc->gif_flags |= GIFF_INUSE;
|
|
#endif
|
|
|
|
switch (sc->gif_psrc->sa_family) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
error = in_gif_output(ifp, dst->sa_family, m, rt);
|
|
break;
|
|
#endif
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
error = in6_gif_output(ifp, dst->sa_family, m, rt);
|
|
break;
|
|
#endif
|
|
default:
|
|
m_freem(m);
|
|
error = ENETDOWN;
|
|
}
|
|
#if 0
|
|
sc->gif_flags &= ~GIFF_INUSE;
|
|
splx(s);
|
|
#endif
|
|
|
|
end:
|
|
called = 0; /* reset recursion counter */
|
|
if (error) ifp->if_oerrors++;
|
|
return error;
|
|
}
|
|
|
|
void
|
|
gif_input(m, af, gifp)
|
|
struct mbuf *m;
|
|
int af;
|
|
struct ifnet *gifp;
|
|
{
|
|
int s, isr;
|
|
struct ifqueue *ifq = 0;
|
|
|
|
if (gifp == NULL) {
|
|
/* just in case */
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
|
|
if (m->m_pkthdr.rcvif)
|
|
m->m_pkthdr.rcvif = gifp;
|
|
|
|
#if NBPFILTER > 0
|
|
if (gifp->if_bpf) {
|
|
/*
|
|
* We need to prepend the address family as
|
|
* a four byte field. Cons up a dummy header
|
|
* to pacify bpf. This is safe because bpf
|
|
* will only read from the mbuf (i.e., it won't
|
|
* try to free it or keep a pointer a to it).
|
|
*/
|
|
struct mbuf m0;
|
|
u_int af = AF_INET6;
|
|
|
|
m0.m_next = m;
|
|
m0.m_len = 4;
|
|
m0.m_data = (char *)⁡
|
|
|
|
bpf_mtap(gifp->if_bpf, &m0);
|
|
}
|
|
#endif /*NBPFILTER > 0*/
|
|
|
|
/*
|
|
* Put the packet to the network layer input queue according to the
|
|
* specified address family.
|
|
* Note: older versions of gif_input directly called network layer
|
|
* input functions, e.g. ip6_input, here. We changed the policy to
|
|
* prevent too many recursive calls of such input functions, which
|
|
* might cause kernel panic. But the change may introduce another
|
|
* problem; if the input queue is full, packets are discarded.
|
|
* We believed it rarely occurs and changed the policy. If we find
|
|
* it occurs more times than we thought, we may change the policy
|
|
* again.
|
|
*/
|
|
switch (af) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
ifq = &ipintrq;
|
|
isr = NETISR_IP;
|
|
break;
|
|
#endif
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
ifq = &ip6intrq;
|
|
isr = NETISR_IPV6;
|
|
break;
|
|
#endif
|
|
default:
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
|
|
s = splimp();
|
|
if (IF_QFULL(ifq)) {
|
|
IF_DROP(ifq); /* update statistics */
|
|
m_freem(m);
|
|
splx(s);
|
|
return;
|
|
}
|
|
IF_ENQUEUE(ifq, m);
|
|
/* we need schednetisr since the address family may change */
|
|
schednetisr(isr);
|
|
gifp->if_ipackets++;
|
|
gifp->if_ibytes += m->m_pkthdr.len;
|
|
splx(s);
|
|
|
|
return;
|
|
}
|
|
|
|
|
|
int
|
|
gif_ioctl(ifp, cmd, data)
|
|
struct ifnet *ifp;
|
|
u_long cmd;
|
|
caddr_t data;
|
|
{
|
|
struct gif_softc *sc = (struct gif_softc*)ifp;
|
|
struct ifreq *ifr = (struct ifreq*)data;
|
|
int error = 0, size;
|
|
struct sockaddr *sa, *dst, *src;
|
|
|
|
switch (cmd) {
|
|
case SIOCSIFADDR:
|
|
break;
|
|
|
|
case SIOCSIFDSTADDR:
|
|
break;
|
|
|
|
case SIOCADDMULTI:
|
|
case SIOCDELMULTI:
|
|
switch (ifr->ifr_addr.sa_family) {
|
|
#ifdef INET
|
|
case AF_INET: /* IP supports Multicast */
|
|
break;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case AF_INET6: /* IP6 supports Multicast */
|
|
break;
|
|
#endif /* INET6 */
|
|
default: /* Other protocols doesn't support Multicast */
|
|
error = EAFNOSUPPORT;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
#ifdef SIOCSIFMTU /* xxx */
|
|
case SIOCGIFMTU:
|
|
break;
|
|
case SIOCSIFMTU:
|
|
{
|
|
u_long mtu;
|
|
mtu = ifr->ifr_mtu;
|
|
if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) {
|
|
return (EINVAL);
|
|
}
|
|
ifp->if_mtu = mtu;
|
|
}
|
|
break;
|
|
#endif /* SIOCSIFMTU */
|
|
|
|
case SIOCSIFPHYADDR:
|
|
#ifdef INET6
|
|
case SIOCSIFPHYADDR_IN6:
|
|
#endif /* INET6 */
|
|
switch (ifr->ifr_addr.sa_family) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
src = (struct sockaddr *)
|
|
&(((struct in_aliasreq *)data)->ifra_addr);
|
|
dst = (struct sockaddr *)
|
|
&(((struct in_aliasreq *)data)->ifra_dstaddr);
|
|
|
|
/* only one gif can have dst = INADDR_ANY */
|
|
#define satosaddr(sa) (((struct sockaddr_in *)(sa))->sin_addr.s_addr)
|
|
|
|
if (satosaddr(dst) == INADDR_ANY) {
|
|
int i;
|
|
struct gif_softc *sc2;
|
|
|
|
for (i = 0, sc2 = gif; i < ngif; i++, sc2++) {
|
|
if (sc2 == sc) continue;
|
|
if (sc2->gif_pdst &&
|
|
satosaddr(sc2->gif_pdst)
|
|
== INADDR_ANY) {
|
|
error = EADDRNOTAVAIL;
|
|
goto bad;
|
|
}
|
|
}
|
|
}
|
|
size = sizeof(struct sockaddr_in);
|
|
break;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
src = (struct sockaddr *)
|
|
&(((struct in6_aliasreq *)data)->ifra_addr);
|
|
dst = (struct sockaddr *)
|
|
&(((struct in6_aliasreq *)data)->ifra_dstaddr);
|
|
|
|
/* only one gif can have dst = in6addr_any */
|
|
#define satoin6(sa) (&((struct sockaddr_in6 *)(sa))->sin6_addr)
|
|
|
|
if (IN6_IS_ADDR_UNSPECIFIED(satoin6(dst))) {
|
|
int i;
|
|
struct gif_softc *sc2;
|
|
|
|
for (i = 0, sc2 = gif; i < ngif; i++, sc2++) {
|
|
if (sc2 == sc) continue;
|
|
if (sc2->gif_pdst &&
|
|
IN6_IS_ADDR_UNSPECIFIED(
|
|
satoin6(sc2->gif_pdst)
|
|
)) {
|
|
error = EADDRNOTAVAIL;
|
|
goto bad;
|
|
}
|
|
}
|
|
}
|
|
size = sizeof(struct sockaddr_in6);
|
|
break;
|
|
#endif /* INET6 */
|
|
default:
|
|
error = EPROTOTYPE;
|
|
goto bad;
|
|
break;
|
|
}
|
|
if (sc->gif_psrc != NULL)
|
|
free((caddr_t)sc->gif_psrc, M_IFADDR);
|
|
if (sc->gif_pdst != NULL)
|
|
free((caddr_t)sc->gif_pdst, M_IFADDR);
|
|
|
|
sa = (struct sockaddr *)malloc(size, M_IFADDR, M_WAITOK);
|
|
bzero((caddr_t)sa, size);
|
|
bcopy((caddr_t)src, (caddr_t)sa, size);
|
|
sc->gif_psrc = sa;
|
|
|
|
sa = (struct sockaddr *)malloc(size, M_IFADDR, M_WAITOK);
|
|
bzero((caddr_t)sa, size);
|
|
bcopy((caddr_t)dst, (caddr_t)sa, size);
|
|
sc->gif_pdst = sa;
|
|
|
|
ifp->if_flags |= IFF_UP;
|
|
if_up(ifp); /* send up RTM_IFINFO */
|
|
|
|
break;
|
|
|
|
case SIOCGIFPSRCADDR:
|
|
#ifdef INET6
|
|
case SIOCGIFPSRCADDR_IN6:
|
|
#endif /* INET6 */
|
|
if (sc->gif_psrc == NULL) {
|
|
error = EADDRNOTAVAIL;
|
|
goto bad;
|
|
}
|
|
src = sc->gif_psrc;
|
|
switch (sc->gif_psrc->sa_family) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
dst = &ifr->ifr_addr;
|
|
size = sizeof(struct sockaddr_in);
|
|
break;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
dst = (struct sockaddr *)
|
|
&(((struct in6_ifreq *)data)->ifr_addr);
|
|
size = sizeof(struct sockaddr_in6);
|
|
break;
|
|
#endif /* INET6 */
|
|
default:
|
|
error = EADDRNOTAVAIL;
|
|
goto bad;
|
|
}
|
|
bcopy((caddr_t)src, (caddr_t)dst, size);
|
|
break;
|
|
|
|
case SIOCGIFPDSTADDR:
|
|
#ifdef INET6
|
|
case SIOCGIFPDSTADDR_IN6:
|
|
#endif /* INET6 */
|
|
if (sc->gif_pdst == NULL) {
|
|
error = EADDRNOTAVAIL;
|
|
goto bad;
|
|
}
|
|
src = sc->gif_pdst;
|
|
switch (sc->gif_pdst->sa_family) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
dst = &ifr->ifr_addr;
|
|
size = sizeof(struct sockaddr_in);
|
|
break;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
dst = (struct sockaddr *)
|
|
&(((struct in6_ifreq *)data)->ifr_addr);
|
|
size = sizeof(struct sockaddr_in6);
|
|
break;
|
|
#endif /* INET6 */
|
|
default:
|
|
error = EADDRNOTAVAIL;
|
|
goto bad;
|
|
}
|
|
bcopy((caddr_t)src, (caddr_t)dst, size);
|
|
break;
|
|
|
|
case SIOCSIFFLAGS:
|
|
break;
|
|
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
bad:
|
|
return error;
|
|
}
|
|
#endif /*NGIF > 0*/
|